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4l80e Trans Overheating

WillyT

By WillyT
in Ask A GM Technician

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WillyT Enthusiast

WillyT

Posted
Posted

2005 Chev 2500HD w/ 4L80E transmission. Started having shifting problems at 40,000 miles which were finally traced to bad torque converter and some selonoids in trans (all have been replaced and now shifts fine). While all of this was being diagnosed (dealer made several calls to gm) i was told to go ahead and continue driving truck around town. Trans abruptly started overheating with normal driving. No difference after repairs completed. I can't go much more than 20 miles unloaded without trans reaching 250. Dealer tried to say that trans fluid should run same temp as engine coolant but i don't ever recall the trans temp exceeding 150 under normal driving conditions. Any thoughts?

Mudddawg Enthusiast

Mudddawg

Posted
Posted
2005 Chev 2500HD w/ 4L80E transmission. Started having shifting problems at 40,000 miles which were finally traced to bad torque converter and some selonoids in trans (all have been replaced and now shifts fine). While all of this was being diagnosed (dealer made several calls to gm) i was told to go ahead and continue driving truck around town. Trans abruptly started overheating with normal driving. No difference after repairs completed. I can't go much more than 20 miles unloaded without trans reaching 250. Dealer tried to say that trans fluid should run same temp as engine coolant but i don't ever recall the trans temp exceeding 150 under normal driving conditions. Any thoughts?

 

 

My transmission does this too to an extent. Mine is a 2004 2500hd with 62000 miles. My trans runs about 180-190 with normal unloaded driving. My buddy has the same truck and his trans runs 130-150 all the time, even in 90degree weather. I ask my dealer and they told the same as you were told. Trans temp would be about the same as engine temp. My question is then why do some run a lot cooler than others?!?!? I have not had any major issues with my shifting. Maybe someone has the answer. I did not mean to hijack or cut in by the way. I am just curious about this as well.

bflat Enthusiast

bflat

Posted
Posted

I too ride on top of one of these troublesom 4l80e trannys. I have had everything internally replaced, including a new torque conv. but I still overheat after about 35 - 40 miles or when I reach interstate speeds. When it overheats, it drops overdrive. then I have to pull over, shut it off, and restart after 30 seconds. The only person who has said they know what the problem is will not tell me. Instead, they want $1,700.00 to rebuild it. Go Figure! I will be looking forward to someone out there coming up with a cure for this disease.

cammiller Enthusiast

cammiller

Posted
Posted

Has the cooler been flushed since the torque converter replacement? The fluid flows directly out of the torque converter into the cooler. Also, remove the shield over the rad and grille area and inspect the space between the rad and condenser for leaves, grass and other stuff.

ZZ327 Senior Enthusiast

ZZ327

Posted
Posted

did you guys try flushing your transmissions? maybe the fluids broken down from overheating too much

Mudddawg Enthusiast

Mudddawg

Posted
Posted
did you guys try flushing your transmissions? maybe the fluids broken down from overheating too much

 

 

I had that done already. I wonder if it has anything to do with the first gear planetary gear whine. Mine does this as do many others, but some do not.

WillyT Enthusiast

WillyT

Posted
  • Author
Posted
Has the cooler been flushed since the torque converter replacement? The fluid flows directly out of the torque converter into the cooler. Also, remove the shield over the rad and grille area and inspect the space between the rad and condenser for leaves, grass and other stuff.

 

I took back to dealer today and hopefully they are doing this. I know they are going to look at the coolers (wish they had listened to me the first time!). I was wondering if somehow the cooler could have gotten clogged with the shavings from the TC and now that you tell me that the fluid flows directly from the converter to the cooler, I suspect this is the problem. Thanks for the info and advice.

bflat Enthusiast

bflat

Posted
Posted

Thanks for the advise. I am going to try the flushing tricks. I do understand how the temp can increase due to poor circulation, I can only hope that it is something that easy!

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

If they did a repair of any kind that involved replacing parts that could have contaminated your system with metal or other material and they did not flush the lines and the cooler, it is time for you get out your gun. The system has to be cleaned thoroughly when this happens and I have seem many techs install an inline filter in the rtn line to catch anything the flush did not remove.

 

This could certainly be your issue as the ports inside a aux cooler are not that big and could easily be blocked.

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